Question

СРОЧНО! Задания на картинках!

Answer 1

$frac{ {x}^{2} - 4}{5x - 10} - frac{ {x + 4x + 4} }{5x + 10} = \ = frac{(x - 2)(x + 2)}{5(x - 2)} - frac{{(x + 2)}^{2} }{5(x + 2) } = \ = frac{x + 2 - (x + 2)}{5} = 0$
$frac{1}{ {(a - 3)}^{2} } - frac{2}{ {a}^{2} - 9} + frac{1}{(a + 3) ^{2} } = \ = ( frac{1}{a - 3} ) ^{2} - 2 times frac{1}{(a - 3)} times frac{1}{(a + 3)} + \ + ( frac{1}{a + 3} ) ^{2} = {( frac{1}{a - 3} - frac{1}{a + 3})}^{2} = \ = {( frac{a + 3 - (a - 3)}{ {a}^{2} - 9} )}^{2} = \ = frac{ {6}^{2} }{ ({a}^{2} - 9) ^{2} } = frac{36}{ ({a}^{2} - 9) ^{2} }$